As filed with the Securities and Exchange Commission on May 26, 2021

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

TETRA TECHNOLOGIES, INC.
(Exact name of registrant as specified in its charter)

TETRA Technologies, Inc.
First Amended and Restated 2018 Equity Incentive Plan
(Full title of the plan)

Elijio V. Serrano

Sr. Vice President and Chief Financial Officer

24955 Interstate 45 North

The Woodlands, Texas 77380

(281) 367-1983

(Name, address, and telephone number, including area code, of agent for service)

Copies to:

David Palmer Oelman

Vinson & Elkins L.L.P.

1001 Fannin Street, Suite 2500

Houston, Texas 77002

(713) 758-2222

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company" in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

CALCULATION OF REGISTRATION FEE

EXPLANATORY NOTE

This Registration Statement is being filed by the Registrant for the purpose of registering an additional 6,325,000 shares of Common Stock that may be issued under the Plan, which shares of Common Stock are in addition to the 6,365,000 shares of Common Stock registered for issuance under the Plan on the Registrant’s Registration Statement on Form S‑8 filed with the Securities and Exchange Commission (the “SEC”) on May 4, 2018 (SEC File No. 333-224679) (the “Prior Registration Statement”).

This Registration Statement relates to securities of the same class as those to which the Prior Registration Statement relate and is submitted in accordance with General Instruction E to Form S‑8 regarding the Registration of Additional Securities. Pursuant to Instruction E of Form S‑8, except as set forth below, the contents of the Prior Registration Statement are incorporated herein by reference and made part of this Registration Statement.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference

The contents of the Prior Registration Statement are incorporated herein by reference and made a part of this Registration Statement.

Item 8.Exhibits

* Filed herewith.

SIGNATURES

The Registrant.  Pursuant to the requirements of the Securities Act, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of The Woodlands, State of Texas, on May 26, 2021.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned officers and directors of the registrant hereby constitutes and appoints Brady M. Murphy, Elijio V. Serrano and Kimberly M. O’Brien, and each of them severally, his or her lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him or her and on his or her behalf and in his or her name, place and stead, in any and all capacities, to sign, execute and file this Registration Statement and any and all amendments (including, without limitation, post-effective amendments), with all exhibits and any and all documents required to be filed with respect thereto, with the SEC or any regulatory authority, granting unto such attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises in order to effectuate the same, as fully to all intents and purposes as he himself or she herself might or could do, if personally present, hereby ratifying and confirming all that said attorneys-in-fact and agents or his or her substitute or substitutes, may lawfully do or cause to be done.

Pursuant to the requirements of the Securities Act, this Registration Statement has been signed by the following persons in the capacities and on the dates stated.